1H2He3Li4Be5B6C7N8O9F10Ne11Na12Mg13Al14Si15P16S17Cl18Ar19K20Ca21Sc22Ti23V24Cr25Mn26Fe27Co28Ni29Cu30Zn31Ga32Ge33As34Se35Br36Kr37Rb38Sr39Y40Zr41Nb42Mo43Tc44Ru45Rh46Pd47Ag48Cd49In50Sn51Sb52Te53I54Xe55Cs56BaLa*Lanthanides57La58Ce59Pr60Nd61Pm62Sm63Eu64Gd65Tb66Dy67Ho68Er69Tm70Yb71Lu72Hf73Ta74W75Re76Os77Ir78Pt79Au80Hg81Tl82Pb83Bi84Po85At86Rn87Fr88RaAc*Actinides89Ac90Th91Pa92U93Np94Pu95Am96Cm97Bk98Cf99Es100Fm101Md102No103Lr104Rf105Db106Sg107Bh108Hs109Mt110Ds111Rg112Cn113Nh114Fl115Mc116Lv117Ts118Og
Mohs hardness
Hardness test according to Friedrich Mohs: “hard substances scratch soft ones”. The hardness value can only be determined in comparison with other materials or material states. The ordinal scale (Mohs scale) is still in use in mineralogy and geology today. Minerals of Mohs hardness 1 to 2 are considered soft, from 3 to 5 as medium hard, and all minerals above Mohs hardness 6 are considered hard.
| Element | Mohs hardness | ||
|---|---|---|---|
| 3Li | Lithium | 0.6 | |
| 4Be | Beryllium | 5.5 | |
| 5B | Boron | 9.3 | |
| 6C | Carbon | 0.51 | |
| 11Na | Sodium | 0.5 | |
| 12Mg | Magnesium | 2.5 | |
| 13Al | Aluminum | 2.75 | |
| 14Si | Silicon | 6.5 | |
| 16S | Sulfur | 2 | |
| 19K | Potassium | 0.4 | |
| 20Ca | Calcium | 1.75 | |
| 21Sc | Scandium | 2.5 | |
| 22Ti | Titanium | 6 | |
| 23V | Vanadium | 7 | |
| 24Cr | Chromium | 8.5 | |
| 25Mn | Manganese | 6 | |
| 26Fe | Iron | 4 | |
| 27Co | Cobalt | 5 | |
| 28Ni | Nickel | 4 | |
| 29Cu | Copper | 3 | |
| 30Zn | Zinc | 2.5 | |
| 31Ga | Gallium | 1.5 | |
| 32Ge | Germanium | 6 | |
| 33As | Arsenic | 3.5 | |
| 34Se | Selenium | 2 | |
| 37Rb | Rubidium | 0.3 | |
| 38Sr | Strontium | 1.5 | |
| 40Zr | Zirconium | 5 | |
| 41Nb | Niobium | 6 | |
| 42Mo | Molybdenum | 5.5 | |
| 44Ru | Ruthenium | 6.5 | |
| 45Rh | Rhodium | 6 | |
| 46Pd | Palladium | 4.75 | |
| 47Ag | Silver | 2.53 | |
| 48Cd | Cadmium | 2 | |
| 49In | Indium | 1.2 | |
| 50Sn | Tin | 1.5 | |
| 51Sb | Antimony | 3 | |
| 52Te | Tellurium | 2.25 | |
| 55Cs | Caesium | 0.2 | |
| 56Ba | Barium | 1.25 | |
| 57La | Lanthanum | 2.5 | |
| 58Ce | Cerium | 2.5 | |
| 72Hf | Hafnium | 5.5 | |
| 73Ta | Tantalum | 6.5 | |
| 74W | Tungsten | 7.5 | |
| 75Re | Rhenium | 7 | |
| 76Os | Osmium | 7 | |
| 77Ir | Iridium | 6.5 | |
| 78Pt | Platinum | 3.5 | |
| 79Au | Gold | 2.53 | |
| 80Hg | Mercury | 1.5 | |
| 81Tl | Thallium | 1.2 | |
| 82Pb | Lead | 1.5 | |
| 83Bi | Bismuth | 2.25 | |
| 90Th | Thorium | 3 | |
| 92U | Uranium | 6 | |